<template>
<div>
  <el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>参数列表</el-breadcrumb-item>
</el-breadcrumb>
<!--警告区域-->
<el-card>
  <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>
  <!--选择商品分类区域-->
  <el-row class="cateSty">
    <el-col>
      <span>选择商品分类：</span>
      <!--选择商品分类的级联选择器-->
      <el-cascader
    v-model="selectCateKeys"
    :options="goodsList"
    :props="categoryProps"
    @change="parentCateChanged" clearable change-on-select></el-cascader>
    </el-col>
  </el-row>
  <!--Tab标签页-->
  <el-tabs v-model="activeName" @tab-click="handleTabsClick">
    <!-- 添加动态参数的面板 -->
    <!-- disabled:是否禁用 -->
    <el-tab-pane label="动态参数" name="many">
      <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible=true">添加参数</el-button>
       <!-- 动态参数数据 -->
      <el-table :data="manyTableData" border stripe>
        <!-- 展开行 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- 循环渲染Tag标签 -->
            <el-tag closable v-for="(item,i) in scope.row.attr_vals" :key="i" @close="handleClose(i,scope.row)">{{ item }}</el-tag>
          <!-- 输入文本框 -->
          <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                    size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
          <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

          </template>
        </el-table-column>
        <!-- 索引号 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
        <!-- 操作区域 -->
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteParams(scope.row.attr_id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-tab-pane>
    <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
      <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible=true">添加属性</el-button>
      <!-- 静态属性数据 -->
      <el-table :data="onlyTableData" border stripe>
       <!-- 展开行 -->
       <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- 循环渲染Tag标签 -->
            <el-tag closable v-for="(item,i) in scope.row.attr_vals" :key="i" @close="handleClose(i,scope.row)">{{ item }}</el-tag>
          <!-- 输入文本框 -->
          <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                    size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
          <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

          </template>
        </el-table-column>
        <!-- 索引号 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="静态名称" prop="attr_name"></el-table-column>
        <!-- 操作区域 -->
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteParams(scope.row.attr_id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-tab-pane>
  </el-tabs>
</el-card>
<!-- 添加动态参数/静态属性的对话框 -->
<el-dialog
  :title="'添加' + titleText"
  :visible.sync="addDialogVisible"
  width="50%" @close="addDialogClosed">
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" class="demo-ruleForm">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

<!-- 修改动态参数/静态属性的对话框 -->
<el-dialog
  :title="'修改' + titleText"
  :visible.sync="editDialogVisible"
  width="50%" @close="editDialogClosed">
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" class="demo-ruleForm">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
</div>
</template>

<script>

export default {
  data() {
    return {
      // 商品分类的数据列表，默认为空
      goodsList: [],
      // 级联选择框的配置对象
      categoryProps: {
        value: 'cat_id',
        label: 'cat_name',
        childern: 'childern',
        expandTrigger: 'hover'
      },
      // 级联选择框双向绑定到的数组
      selectCateKeys: [],
      // Tab标签页的数据双向绑定——被激活的标签页的name
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: [],
      // 控制对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {},
      // 添加表单的验证规则
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改表单的数据对象
      editForm: {},
      // 修改表单的验证规则
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制tag文本输入框的显示与隐藏
      inputVisible: false,
      // 文本框输入的数据
      inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    // 如果按钮被禁用，则返回true 否则返回false
    isBtnDisable() {
      if (this.selectCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 获取级联选择框的第三级商品分类id
    cateId() {
      if (this.selectCateKeys.length === 3) {
        return this.selectCateKeys[2] // 返回数组下标2
      }
      return null
    },
    // 动态计算标题的文本（对话框）
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取数据失败')
      }
      this.goodsList = res.data
      console.log(this.goodsList)
    },
    // 级联选择框中的项变化，会触发这个函数
    parentCateChanged() {
      this.getPramasData()
    },
    // 获取参数列表的数据（共有数据）
    async getPramasData() {
      // 证明选中的不是三级分类
      if (this.selectCateKeys.length !== 3) {
        this.selectCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      console.log(this.selectCateKeys)
      // 根据所选的分类id和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类动态参数失败！')
      }
      this.$message.success('获取商品分类动态参数成功！')

      // 循环attr_vals每一项，变成数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 输入文本框的数据
        item.inputValue = ''
      })
      console.log(res.data)

      // 判断动态参数/静态属性
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    handleTabsClick() {
      console.log(this.activeName)
      this.getPramasData()
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFileds()
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getPramasData()
      })
    },
    // 监听修改对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFileds()
    },
    // 点击按钮，修改参数数据
    editParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改数据失败！')
        }
        this.$message.success('获取数据成功！')
        this.getCateList()
        this.editDialogVisible = false
      })
    },
    // 点击按钮，显示修改的对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 根据id删除对应的参数项
    async deleteParams(id) {
      // 弹窗提示用户是否删除数据
      const confirmResult = await this.$confirm('此操作将永久删除该商品分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果用户确定删除，则返回值为字符串：confirm
      // 如果用户取消删除，则返回值为字符串：cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 发起删除用户axios请求
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除商品分类失败！')
      }
      this.$message.success('删除商品分类成功！')
      this.getCateList()
    },
    // Tag标签：当文本框事情焦点 或按下enter键时都会触发这个函数
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 点击按钮，显示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获取焦点
      // $nextTick方法作用：当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 将对attr_vals的操作保存到数据库中
    async saveAttrVals(row) {
      // 需要发起请求，保存本次操作的数据
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败！')
      }
      this.$message.success('修改参数成功！')
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  }
}
</script>

<style lang="less" scoped>
.cateSty{
  margin: 20px 0;
}
.el-tag{
  margin: 10px 5px;
}
.input-new-tag{
  width: 120px;
}
</style>
